unwind-ehabi-helpers.h revision 1.1.1.1
1//===-- arm-ehabi-helpers.h - Supplementary ARM EHABI declarations --------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===--------------------------------------------------------------------===// 8 9#ifndef UNWIND_EHABI_HELPERS_H 10#define UNWIND_EHABI_HELPERS_H 11 12#include <stdint.h> 13// NOTE: see reasoning for this inclusion below 14#include <unwind.h> 15 16#if !defined(__ARM_EABI_UNWINDER__) 17 18// NOTE: _URC_OK, _URC_FAILURE must be present as preprocessor tokens. This 19// allows for a substitution of a constant which can be cast into the 20// appropriate enumerated type. This header is expected to always be included 21// AFTER unwind.h (which is why it is forcefully included above). This ensures 22// that we do not overwrite the token for the enumeration. Subsequent uses of 23// the token would be clean to rewrite with constant values. 24// 25// The typedef redeclaration should be safe. Due to the protection granted to 26// us by the `__ARM_EABI_UNWINDER__` above, we are guaranteed that we are in a 27// header not vended by gcc. The HP unwinder (being an itanium unwinder) does 28// not support EHABI, and the GNU unwinder, derived from the HP unwinder, also 29// does not support EHABI as of the introduction of this header. As such, we 30// are fairly certain that we are in the LLVM case. Here, _Unwind_State is a 31// typedef, and so we can get away with a redeclaration. 32// 33// Guarded redefinitions of the needed unwind state prevent the redefinition of 34// those states. 35 36#define _URC_OK 0 37#define _URC_FAILURE 9 38 39typedef uint32_t _Unwind_State; 40 41#if !defined(_US_UNWIND_FRAME_STARTING) 42#define _US_UNWIND_FRAME_STARTING ((_Unwind_State)1) 43#endif 44 45#if !defined(_US_ACTION_MASK) 46#define _US_ACTION_MASK ((_Unwind_State)3) 47#endif 48 49#endif 50 51#endif 52